10R100 applications

Reply Subscribe

Thread Tools

Search this Thread

Feb 26, 2025 | 01:42 PM

#46

Ford8502

More Turbo

Joined: Dec 2011

Posts: 739

Likes: 393

Quote:

Originally Posted by Isthatahemi

Counterpoint:

Lighter duty elements can be more efficient and easier to calibrate, because they operate closer to capacities and tolerances. A good example is putting too large axles on too light of a truck, large unspring weight that needs to be managed, without the counteracting weight of a heavier vehicle.

Also, assuming the 10R100 is rated for 738ft/lbs, why does this matter? That's over 50% more than the gas engines put out.

Now, if you are planning on supercharging and being unkind to your truck, that would be the only situation I can see it mattering.

What kind of idiot would supercharge a 7.3L F250?

Feb 26, 2025 | 03:58 PM

#47

seijirou

Cargo Master

Joined: Aug 2012

Posts: 2,844

Likes: 926

From: Kaufman TX

Quote:

Originally Posted by twobelugas

Then why offer the 10R140 with the 7.3 at all in Tremor and 350 applications? 4.30 and 35 inch tires in 250 doesn't add 50% load to the driveline compared to 33 inch on 3.73 gearing.

My pure speculation is because a Tremor F250 literally is an F350 in every way. When they've got 350's on the line it's the 10r140s they've got queued up to go in. When 250's are on the line it's the 10r100's. It's not because they think there's some strength requirement because it's a tremor, it's simply assembly logistics and they may not be set up to have 2 transmission options. Those 350 builds that then get badged as 250 Tremors further down the line, well that's a further down the line thing.

Feb 26, 2025 | 04:40 PM

#48

81Vortec

4wd Low

Joined: Sep 2024

Posts: 12

Likes: 2

But what is a 10r100? Isn't that the real question.
Did they build a complete new transmission?
Or is it gas 10r140 detuned some more?
or is it a 10r80 with that was tuned up?

Feb 26, 2025 | 09:12 PM

#49

Isthatahemi

Mountain Pass

Joined: Oct 2024

Posts: 194

Likes: 134

It just doesn't matter what it is, because all these transmission are tough as nails, my experience, having tuned and flogged these trucks brutally over the years, is that their failures are 99% due to lack of QC, and not under engineering strength wise, with notable exceptions, but not the 10 speeds transmissions.

Very few people will power up these trucks enough to stress the transmission..... It's all bout keeping it within spec temps, run an R140 hot, it likely won't last as long as an R100 ran within spec.

Jokes on us if the second number is mostly a cooling spec......just thought of that, damn.

Feb 26, 2025 | 10:18 PM

#50

GAZZILLA

Cargo Master

Joined: Apr 2021

Posts: 2,573

Likes: 1,656

From: Bighorn Basin, NW Wyoming

I forget what video I saw comparing the parts of the 10R140 to those of the 10R100 but the differences in the overall size of the parts of the two was huge. The 10R140 is a much more robust transmission than the 10R100. The 10R100 is a beefed up half ton transmission design for 6.8L gas 3/4 ton fleet trucks.

Feb 26, 2025 | 11:12 PM

#51

Isthatahemi

Mountain Pass

Joined: Oct 2024

Posts: 194

Likes: 134

Interesting point so you are saying the 10R100 is a 10R80 derivative? I had a supercharged F150 with an R80, and well over a thousand boosted launches, drove like new when I sold it.

Feb 26, 2025 | 11:31 PM

#52

seijirou

Cargo Master

Joined: Aug 2012

Posts: 2,844

Likes: 926

From: Kaufman TX

I'd love to see a 10r100 breakdown. I've looked often and have never found anything. 10r80 and 10r140 I can find, not the 10r100.

Feb 27, 2025 | 10:50 AM

#53

DPelletier

Thread Starter

Fleet Mechanic

Joined: Aug 2022

Posts: 1,581

Likes: 1,116

I'm interested in the differences too but I'll still stick with the 10R140; IMO the expansion of the 10R100 to the 7.3 in the 250's is purely a cost cutting move and most people don't even know that there are two different 10 spd trannies used in the SD.

Dave